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Botany 974
Natural history 812
Plants 686
Birds 566
Zoology 486
Periodicals 413
Mollusks 263
Biology 253
Insects 231
Fishes 195
Science 184
Paleontology 178
Pictorial works 169
Entomology 168
Fruit Catalogs 159
Vegetables Seeds Catalogs 158
Flowers Seeds Catalogs 151
Lepidoptera 117
Plants, Ornamental Catalogs 112
Agriculture 103
Ornithology 102
Scientific expeditions 101
Flowers Catalogs 89
Nurseries (Horticulture) Pennsylvania Pittsburgh Catalogs 87
Mammals 86
Flowers Seeds Pennsylvania Pittsburgh Catalogs 84
Fruit trees Seedlings Catalogs 84
Nursery stock Pennsylvania Pittsburgh Catalogs 84
Correspondence 77
Ethnology 77
Bulbs (Plants) Pennsylvania Pittsburgh Catalogs 75
Pteridophyta 75
Fruit trees Catalogs 74
1809-1884 73
Engelmann, George, 73
Trees Seedlings Catalogs 72
Letters 70
Beetles 68
Reptiles 68
Animals 67
Fish habitat improvement 65
Nurseries (Horticulture) 65
Wildlife habitat improvement 65
Ecology -- United States 64
Gardening 64
Nurseries (Horticulture) Catalogs 64
Forests and forestry 63
Invertebrates 63
Trees Catalogs 62
Flowers 60
Animal behavior 59
Crustacea 59
Classification 58
Geology 58
Malayan languages 58
Natural history -- Great Basin 58
Early works to 1800 57
Butterflies 55
Mollusks, Fossil 54
Shrubs Catalogs 53
Amphibians 51
Antarctica 50
Bulbs (Plants) Catalogs 50
Botany, Medical 49
Moths 47
Nursery stock 47
Plants, Ornamental, Catalogs 46
Poultry 46
Seeds 45
Gardening Equipment and supplies Catalogs 43
Ichthyology 43
Pre-Linnean works 43
Shells 43
Brewster, William, 1851-1919 42
Flowers, Seeds, Catalogs 42
Plants, Cultivated 42
Botanical specimens 41
Pulmonata 40
Trees 39
Microscopy 38
Vegetables Seeds Pennsylvania Pittsburgh Catalogs 36
Field Naturalists' Club of Victoria 35
Fruit-culture 35
Agriculture -- France 34
Horses 33
botany 33
Bacteriology 32
Fruit trees 32
Vegetables, Seeds, Catalogs 32
Bees 31
Brewster, William, 1851-1919 -- Diaries. 30
Ferns 30
Fungi 30
Indians of North America 30
Ornithology. 30
Fisheries 29
Invertebrates, Fossil 29
Birds -- Periodicals 28
British Museum (Natural History) 28
Copper engraving 28
Great Britain 28
Mammalogy 28
Fruit trees, Catalogs 27
Gardening Pennsylvania Pittsburgh Equipment and supplies Catalogs 27
Identification 27
Mammologists 27
Grasses Seeds Catalogs 26
Liliaceae 26
Oceanography 26
Plant breeding 26
Graphic media : 25
Historical geology 25
Hunting 25
Plants -- Great Britain 25
Voyages around the world 25
Anatomy, Comparative 24
Arachnida 24
Hemiptera 24
Microscopy -- Technique 24
Myriapoda 24
Uncolored 24
Berries 23
Herpetology 23
Hymenoptera 23
Nurseries (Horticulture), Catalogs 23
Seed industry and trade 23
Worms 23
Catalogs and collections 22
Embryology 22
Evolution 22
Fruit 22
Materia medica, Vegetable 22
Medicinal plants 22
Botanists 21
Diptera 21
Game and game-birds 21
Nature 21
Asparagus Catalogs 20
Bulbs (Plants) 20
Catalogs 20
Description and travel 20
Grain 20
Plants -- France 20
Vegetables 20
Bering Sea controversy 19
Fishing 19
Freshwater animals 19
Fruit Seedlings Catalogs 19
Nursery stock New York (State) New York Catalogs 19
Nut trees 19
Snakes 19
Tobacco 19
United States 19
Urban parks 19
Algae 18
Amaryllis 18
Burbank, Luther Company 18
Fruit Seeds Catalogs 18
Fruit, Catalogs 18
Gastropoda 18
Grasses 18
Insect pests 18
Mites 18
Pacific railroads 18
Biology -- Periodicals 17
Cactaceae 17
Homoptera 17
Indians of South America 17
Marine animals 17
Ornamental shrubs, Catalogs 17
Public works 17
Sealing 17
Soils 17
Agricultural implements Catalogs 16
British Museum (Natural History). Dept. of Zoology 16
Collection and preservation 16
Freshwater animals -- Germany 16
Gardening Pennsylvania Pittsburgh Equipment and 16
Mammals, Fossil 16
Nursery stock Catalogs 16
Nursery stock New York (State) Catalogs 16
Ornamental trees Catalogs 16
Strawberries Catalogs 16
Veterinary medicine 16
Dogs 15
Marine biology 15
Nursery stock Massachusetts Catalogs 15
Plants, Ornamental 15
Cnidaria 14
England 14
Fungi -- France 14
Herbals 14
Heredity 14
Hummingbirds 14
Paleobotany 14
Seeds Catalogs 14
Trematoda 14
United States Dept. of Agriculture 14
Voyages and travels 14
rbgenr 14
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